Thus, an equilibrium was reached, the newly formed carbon replacing the carbon that decayed, so that there was always a small amount in the atmosphere. In American chemist Willard Libby figured that plants would absorb some of this trace carbon while they absorbed ordinary carbon in photosynthesis. In the Radiation Laboratory at Berkeley began experiments to determine if any of the elements common in organic matter had isotopes with half-lives long enough to be of value in biomedical research. It was soon discovered that 14C’s half-life was far longer than had been previously thought, and in this was followed by proof that the interaction of slow neutrons with 14N was the main pathway by which 14C was created. It had previously been thought that 14C would be more likely to be created by deuterons interacting with 13C. Korff, published in , which predicted the creation of 14C in the atmosphere by neutrons from cosmic rays that had been slowed down by collisions with molecules of atmospheric gas. It was this paper that gave Libby the idea that radiocarbon dating might be possible.
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